Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof, its right side being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof in an open condition; and,

FIG. 6 is a right side elevational view thereof in a standing condition, its left side being a mirror image. 

The ornamental design for a clock, as shown and described. 